水利学报2026，Vol.57Issue(7)：1038-1051,14.DOI:10.3724/j.slxb.20250675
降雨入渗流量与压力控制边界双向转换机制及边坡裂隙渗流分析
Bidirectional conversion mechanism of rainfall infiltration flow-controlled and pressure-controlled boundaries and slope fracture seepage analysis
摘要
Abstract
Rainfall infiltration significantly affects slope stability.Accurately describing the dynamic behavior of the rainfall infiltration boundary is crucial for analyzing seepage and stability of slopes.Although the unidirectional con-version from flow-controlled to pressure-controlled boundaries has been achieved,several challenges remain.These include the unclear mechanisms in the governing equation and the lack of bidirectional conversion of boundary condi-tions,especially regarding treatment of the rainfall infiltration boundary in fracture-pore media.To this end,based on Darcy's seepage theory,this study reformulates the pressure governing equation,and establishes a rainfall infiltra-tion governing equation that can achieve bidirectional conversion between flow-controlled and pressure-controlled boundaries.Then,rainfall infiltration boundary treatment methods are proposed for discrete fracture-pore media and dual-permeability media.Three challenges are addressed:(1)a position head gradient is introduced to eliminate the influence of semi-permeable layer thickness on the depth of surface water accumulation;(2)a bidirectional conver-sion mechanism with two judgment conditions is developed to achieve adaptive control of the rainfall infiltration boundary;and(3)a rainfall infiltration boundary treating method is proposed to reveal the influence of rainfall inten-sity on the water exchange between the dual media.The results show that the proposed method can effectively allevi-ate the errors induced by the conventional rigid,one-way conversion between rainfall infiltration boundaries.Further-more,fractures are shown to play a significant role in the slope rainfall infiltration process.Under the low-intensity rainfall condition,the matrix dominates water transport,while the fractures become the primary seepage channels under the high-intensity rainfall.These findings provide theoretical support for studying slope fracture seepage and failure mechanism.关键词
边坡/降雨入渗边界/裂隙渗流/离散裂隙-孔隙介质模型/双重渗透介质模型/混合边界条件Key words
slopes/rainfall infiltration boundary/fracture seepage/discrete fracture-pore media model/dual-permeability media model/mixed boundary condition分类
建筑与水利引用本文复制引用
蒋水华,葛成民,常志璐,周创兵..降雨入渗流量与压力控制边界双向转换机制及边坡裂隙渗流分析[J].水利学报,2026,57(7):1038-1051,14.基金项目
国家自然科学基金项目(52579103,52222905,42407241) （52579103,52222905,42407241）
江西省自然科学基金项目(20252BCG330025,20242BAB24001,20253BDH410009) （20252BCG330025,20242BAB24001,20253BDH410009）
